Extension bit



May 12, 1931. TJJ. FEGLEY ETAL EXTENSION BIT Filed Feb. 13, 1930 Patented May 12, 1931 nmr sTA'rEs THOMAS 3'. FEGLEY AND GEORGE 0. LEOPOLD, OF PHILADELPHIA, PENNSYLVANIA, AS-

SIGNORS ISO NORTH'BROS. MFG.'CO., OF PHILADELPHIA, PENNSYLVANIA, A GOR- POE-A'IION OF PENNSYLVANIA .EXTENSTON BIT Application filed February 13, 1930; Serial No. 428,111.

Our invention relates to certain improvements in extension bits used in connection with braces or hand-drills.

One object of our invention is to improve the construction of this type of extension bit by providing a yielding socket for the said extension bit, which will accommodate itself to a bit and which'can be adjusted to firmly hold the shoulder of the bit against the shoulder of the casing of the extension bit.

A further object of the invention is to provide means to. prevent the movable socket from yielding when the bit is being turned in use, so that the bit will not become detached from the extension bit.

The invention also relates to certain details of construction which will be described hereinafter.

In the accompanying drawings,-

Figure 1 is a side view of our improved extension bit;

Fig. 2 is a view similar to Fig. 1, with the outer casing and sleeve in section;

Fig. 3 is a side view of the forward end of the extension bit, the casing being in section,

on the line 3-3, Fig. 2;

Fig. 4 is an end view of the outer end of the bit;

Fig. 5 is a sectional view of the outer end of the extension bit showing the shank of an ordinary bit in position;

Fig. 6 is a sectional end view on the line 66, Fig. 5;

Fig. 7 is a detached perspective view of the main spindle of the bit;

Fig. 8 is a detached perspective view of the screw sleeve;

' Fig. 9 is a detached perspective view of the movable socket of the bit; and

Fig. 10 is a detached perspective view of the key which is secured to the main spindle of the bit, and extends through a slot in the casing.

Referring to the drawings, 1 is the spindle of the bit, having a rectangular shank 2 adapted to fit the opening in the chuck of the brace or drill to which it is applied. On the spindle is a collar 3, secured thereto by a pin 4. 5 is the head of the spindle. This head has a reduced portion 6, flat on each side. At the base of the reduced portion is a shoulder 7. Beyond the portion 6 is a narrow portion 8, which is of the same thickness as the portion 6 but less in width, forming shoulders 9 at right angles to the shoulder 7 10 is a movable socket which has a rectangular and tapered opening 11 in the present instance to receive the shank of an ordinary drill bit. This socket member is slotted at 12 to form two portions 13. The socket memher is a trifle wider than the portion 6 of the main spindle and straddles this portion 6 as shown in Fig. 2. The socket member has a bore 14:, which is the same width as the extension 8 of the head 5, and this'bore is continued into the two portions of the socket which are separated by the slot 12. A pivot pin 15 extends into the bore It in the portions 13 on each side of the slot. This pin connects the socket member with the main spindle and while it allows it freedom to move longitudinally, the socket member cannot be detached from the spindle without driving the pin. Located in the recess 17 of the main spindle is a coil-spring 16. The upper end of this spring is adapted to a notch 17 a in the socket memberlO. This spring tends to force the socket member away from the shoulder 7 of the spindle and towards the inner shoulder 30 on the casing 24:. p

b In order to prevent the socket lO becoming loose when the tool is being used, a series of teeth 18 on the portion 6 of the head of the spindle 1 engage similar teeth 19 on one wall of the slot 12 of the movable socket when the tool is turned. The teeth firmly lock the movable socket to the spindle, so that the shank a of the bit, which is mounted in the socket, will be held firmly against the shoulder 30 of the casing while the tool is being the'sleeve is turned. The tubular casingfits over the end. of the movable socket 10, and in theend of the casing is arectangular open-' ing 29 and back of this opening is a shoulder 30, against which the shank a of the drill bit is held by the movable socket 10, as shown in i key 27 which is secured to the spindle, projects into a slot 25 in the casing 24, so that when the sleeve is turned, the casing will be moved longitudinally on the spindle, being held from turning by the key. The lower end of the slot is enlarged as at 26, 5 so as to allow the casing 24; to be rotated a certain distance independent of the spindle. lVhen the key 27 is in the narrow portion of the slot 25, then the rectangular opening 29 in the casing is out of line with the rectangular opening 11 in the socket, as illustrated in Fig. 6, but when the sleeve-20 is turned so as to bring the wide portion 26 of the slot in alignment with-the key 27, then the casing can be turned so as to bring the two openings 29 and 11 in alignmennas in Fig. 4. lVhen inthis position'the shank a of a bit can be inserted in the end of the extension bit, and on turning the casing so that the narrow portion of the slot 25 will be in alignment with the key, the opening in the casing will be out of alignment with the opening in the socket; then on turning the sleeve 20 tomove the casing longitudinally, the key enters the slot 25 and the casing is held from turning, and on continuing the movement, the movable socket 10-is moved towards thee'nd of the extension bit and clamps the shank a'ofthe bit firmly against the shoulder 30 of the easing, as the rectangular opening 29 in the casing is out of alignment with the opening 11 in the movable socket.

The spring 16 allows the movable socket to yield to a-limited extent, and on turning the extension bit when in use the teeth on the portion Got the head 5 engage'the teeth on the'movable socket, locking the socket firmly to the spindle and preventing accidental displaoementof the drill or augerbit when in use.

We claim:

1. The combination in an extension bit,'of a spindle; a head secured to the spindle; a socket adapted to slide 011 the head and a spring arranged to project the socket; a slot ted casing enclosing the socket; means for vertically adjusting the casing; and akey adapted to travel in a slot in the casing, the slot having a lateral portion to allow the sleeve to beturned to-a limited extent independently of the spindle, so that when the parts are in one position, the opening in the end of the casing will align with the opening in the socket, and when in the other position it will be out of line and lock the shank of the bit in the socket.

2. The combination'in an extensionbit, of a spindle having an extension; a sliding socket member mounted on the extension of the spindle; teeth on both portions arranged to engage one with the other when the bit is turned; a spring for projecting the socket member; a casing enclosing the socket and a portion of the spindle; a threaded sleeve mounted on the spindle and engaging the thread on the casing a key on the spindle extending into a slot in the casing so that when the casing is projected by turning the sleeve, the-key will be in line'withthe enlarged portion of-the s'lot,-allowin'g-the casing to turn so that the-opening in the end of-the easing will be in line with the opening in the end of the socket.

3. The combination in an extension bit, of a casing having an opening in the end thereof; a socket having a :similar opening and arrangedto receive the shank'of a bit; a spindle carrying thersocket, the socket having a vertical slot therein; a projection on the spindle extending intothe slot, one wall of the slot having teeth thereon; and one face of the projection also having teeth arraged'to mesh withthe teeth inthe walls of the slot when the spindleisturned'on using the bit, preventing independent movement ofthe socket onthe spindle.

THOMAS J. EEGLEY.

GEORGE O. LEOPOLD. 

